I was playing around with this move yesterday, following Dudley Wolford's ideas - vertical drop, followed by a trail side lower body move towards the ball.
I prefer to rather aggressively turn the trail hip towards the balls, instead of sliding/sitting into the lead knee, it also brings the trail elbow into the trail side, almost automatically.
The acute transition from ‘vertical' to ‘horizontal' will produce additional club head speed. It is related to the change in the effective instantaneous swing radius.
